该系统利用了一个多级图像描述模型将语义特征结合到图像检索技术中。
In this paper, a novel system for content-based image retrieval is designed and created, which combines image semantics based on a multi-level model for image description.
本文简单介绍了构成环境扫描电镜（ESEM）的多级真空系统和气体二次电子探测器，描述了ESEM的基本工作原理。
The multi-stage vacuum system and gaseous secondary electron detector(GSED) for environmental scanning electron microscope(ESEM) were simply introduced and the basic principle of ESEM was discussed.
多级多组分精馏过程的数学模型，通常都由物料平衡、能量平衡、相平衡和分子分数总和四个方程组来描述，即MESH方程组。
The mathematic model of multistage multi-component distillation is composed of material equation, heat equation, and equilibrium equation, namely MESH equation.
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